BlueCruise jumps to 90 MPH

knowland · 2022-07-17T11:59:36-0400

I took a road trip from the Bay Area to Santa Barbara and was using Blue cruise on a section of 101 in San Luis Obispo when all of a sudden the Lightning just took off!

I looked down and BlueCruise was registering the speed limit as 85 MPH (the posted speed was 65 MPH) and set my target speed for 90 MPH!

This happened both on my way to Santa Barbara and on my way back to the Bay. On my way back I grabbed a picture before hitting the brakes.

Speedometer Trip computer Motor vehicle Car Odometer

This is crazy, right? Has anyone else experienced this?

THEsocalledfan · 2022-07-17T15:07:05-0400

Clearly, the truck is possessed! Get some video, pitch to the History channel, and get your very own reality TV show.....

FM_Jack · 2022-07-17T15:33:52-0400

Nope, mine has been cutting off at 81-ish like the Mach E

knowland · 2022-07-17T15:48:12-0400

@FM_Jack was that after manually setting the speed or did your vehicle also auto-detect an incorrect speed limit?

Note that the max speed limit in California is 70.

Voltz · 2022-07-17T15:54:31-0400

I would have expected the logic to check OCR speed limit inputs with a database, especially anything above 70 or 80 mph. A few short pieces of electrician's tape turns 65 into 85. It wasn't even needed here.

FM_Jack · 2022-07-17T16:57:55-0400

knowland said:
@FM_Jack was that after manually setting the speed or did your vehicle also auto-detect an incorrect speed limit?

Note that the max speed limit in California is 70.

I could see that, I haven't had it happen to me yet. I normally hit the button to activate the system. So it'll set that speed I'm doing but I turned off the setting that set it based on the speed limit. I don't like that. If you haven't done that, try that?

the main highway by me is a speed limit of 70 and that hasn't happened to me in the Mach E or the Lightning but I've only been on that road (aptly named rt 70) a couple of times since Saturday with the Lightning. I'll be heading to work on Tuesday. But that's never happened in the Mach E and I have the "intelligent" portion of it turned off (which I saw it doesn't have the same name as the Mach E)

Leaf to Lightning : ) · 2022-07-17T20:02:39-0400

I had this happen on the Model 3 Long-range, if you let it 'see' the road signs and choose how it will respond to them - I DON'T like this and will never allow the vehicle to decide on my speed.

knowland · 2022-07-17T22:53:56-0400

It seems crazy that the speed limit detection is purely optical rather than a database or some combination with basic validation.

At first I liked that it would automatically decrease/increase my speed when, for example, passing through a small town - mainly as a way to avoid speed traps, but this error has me siding with folks to turn the feature off.

The other time when this backfires is in construction zones where it would drop from 65 to 55 rapidly and piss off anyone behind me.

I am still curious why it picked up 85 MPH on 101 North and South in San Luis Obispo - if this is all based on OCR then I wonder if someone tinkered with the speed limit signs because I haven't had this issue anywhere else.

Regardless, way too finicky of a technology to trust without serious improvements.

ChasingCoral · 2022-07-18T02:53:34-0400

This is a known problem in the optical speed sign recognition system. I’ve had my Mach E suddenly jump up to 84 mph when it misread a small exit sign for SR-84 in Ft. Lauderdale.

btreece · 2022-07-18T09:06:26-0400

knowland said:
I took a road trip from the Bay Area to Santa Barbara and was using Blue cruise on a section of 101 in San Luis Obispo when all of a sudden the Lightning just took off!

I looked down and BlueCruise was registering the speed limit as 85 MPH (the posted speed was 65 MPH) and set my target speed for 90 MPH!

This happened both on my way to Santa Barbara and on my way back to the Bay. On my way back I grabbed a picture before hitting the brakes. View attachment 3403

This is crazy, right? Has anyone else experienced this?

Yes, the system misread a speed limit sign - It says 85 on the dash. You probably have the cruise speed to be +5 mph over the speed limit.

ZSC100 · 2022-07-18T13:12:24-0400

This is a terrible black eye on machine vision. The programmers made a huge mistake here not double checking the optical speed limit with a database means before raising it. Lowering based on optical observation would be ok, but raising should've been hard coded to double check first.

Voltz · 2022-07-18T13:18:38-0400

btreece said:
Yes, the system misread a speed limit sign - It says 85 on the dash. You probably have the cruise speed to be +5 mph over the speed limit.

If it misread 65 without fail-safe logic, it wouldn't be any harder to misread 35, whether the signs have been black tape vandalized or not.

ZSC100 · 2022-07-18T13:38:25-0400

Fail-safe logic when using machine vision for anything with a human safety component is learned in Machine Vision 101. A single IF statement cross checking the optical detected speed with the max speed in the current state would've fixed this.

ChasingCoral · 2022-07-18T17:00:54-0400

This is why all of these are Advanced Driver ASSIST Systems. As the driver, you must be ready to take over control at any time.

Dave O · 2022-07-19T13:54:44-0400

I had to turn that off, it can't distinguish between a normal speed limit sign and one for trucks or buses. So driving I-90 near chicago it would read 70, 65, 60.

2023 lighting · 2022-07-22T17:07:42-0400

Google maps knows what the posted speed limit is based on location. Ford should be tapping into yhis existing technology and using sign recognition as a failsafe not a primary.

ChasingCoral · 2022-07-23T05:42:39-0400

2023 lighting said:
Google maps knows what the posted speed limit is based on location. Ford should be tapping into yhis existing technology and using sign recognition as a failsafe not a primary.

Ford has those data in its onboard maps as well. It's all a question of how they are programming the decision-tree. Be glad it uses the sign recognition when you enter a temporary or new slower speed zone (less than the map will show) and the truck saves you a speeding ticket.

2023 lighting · 2022-07-23T07:49:57-0400

ChasingCoral said:
Ford has those data in its onboard maps as well. It's all a question of how they are programming the decision-tree. Be glad it uses the sign recognition when you enter a temporary or new slower speed zone (less than the map will show) and the truck saves you a speeding ticket.

Even more perplexing why ford would allow an erroneously read sign to speed up faster than the in dash database knows is legal.
Illustrating the need for computer programmers to have strong real world experiences in mind as software is designed.

tprpicscom_8097 · 2022-07-24T08:15:48-0400

knowland said:
I took a road trip from the Bay Area to Santa Barbara and was using Blue cruise on a section of 101 in San Luis Obispo when all of a sudden the Lightning just took off!

I looked down and BlueCruise was registering the speed limit as 85 MPH (the posted speed was 65 MPH) and set my target speed for 90 MPH!

This happened both on my way to Santa Barbara and on my way back to the Bay. On my way back I grabbed a picture before hitting the brakes.

This is crazy, right? Has anyone else experienced this?

I just took delivery two days again, cruise was set at 35 and all of a sudden blue cruise jumped it to 59 mph out of the "blue".

2023 lighting · 2022-07-24T21:23:28-0400

tprpicscom_8097 said:
I just took delivery two days again, cruise was set at 35 and all of a sudden blue cruise jumped it to 59 mph out of the "blue".

How could it believe 59 was a posted speed limit! That's just sad.

BlueCruise jumps to 90 MPH

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